Quantum Entanglement, Dark Counts, Coincidence Detection

[mindwalker_i]

49. I'm going to have to read through this a few times

Information density is increasing, and edging to the limits of my knowledge, which is great! Now my mind is being stretched.

I want to, first, recreate Dopfer's experiment but with an MZ instead of double slits, since too many photons are lost hitting neither slit. Using a coincidence detector for the first stage is fine. You mentioned they were a couple hundred bucks, which is within my budget (better be if I'm getting BBO crystals and detectors). I was also going to look at the raw output of the detectors witha logic analyzer (and probably oscilloscope at some point) - see Sealig for USB logic analyzers. I want to se the interference pattern and see it get destroyed with the "long arm" detector at different distances behind the lens, just to make sure it all works with the MZ.

The next step will be to remove the coincidence detector and see whether the interference still changes. I need to understand your argument above to grasp why that might not work. If I understand correctly, this is all kind of like the quantum eraser, and by moving the lens and detector physically further from the BBO, it becomed a delayed-choice quantum eraser. If the delayed-choice quantum eraser worked, and removing the coincidence detector from my psuedo-Dopfer experiment works, I would thing the retrocausal signaling would work. There are limits to what is understood about QM and entanglement effect, then there are more limits to what I understand about them.